i must start with a baseball ballpark in a small town, and could been able to find the proper and exact measures of it

I think this can answer your question. Click on the images below to display the full size images.

In baseball, there is no standard outfield distance (distance from home plate to the outer edge of the playing field). For municipal parks, recommended distances range from 300' to 350' (90 meters to 107 meters).

Measurements shown on the drawings are in English units ; you may have to convert them to metric units.

1 inch ["] = 2.54 centimeters
1 foot ['] (12 inches) = 0.3048 meters

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